Head for compasses.



y155.806.581. PATENT-ED DB0. 5, 1505.

G. SGHOENNER. A

- HEAD PoR ooMPAssBs.

APPLICATION FILED FEB. 16. 1905.

' K -IaUe/ZZZ? y Jcra/z 7" y UNITED sTATEs PATENT OEEIGE.4

.GEORG scHoENNER, or NUREMRERG' GERMANY.

i Al-n-:AD Fon CO'MPASSES.

To a/ZZ whom it may concern/.f

Be it known that I,GEORG SCEOENNER, manufacturer, a subject ofthe German Emperor, residing at Nuremberg, Bavaria, Germany, have invented new and useful Improvements in Headsfor Compasses, of which the following is a specification.

In the ordinary heads of compasses or bwpens the laws of the head are-held in position y two isplaceable screws with proj ecting .are pressed against the aws of the vcompasshea by means of a tightening-screw located over the compass-headzand are thus held at an immovable distance apart.

The invention is illustrated in the accompanying drawings, in which- Figure l is a side view, partly in section; and Fi 2 is a front view.

The andle a of the head is provided with a longitudinal slot b, which is continued through the two arms c and d and the bar e connecting' them, and thereby allows of a moderate springing apart of the arms of the bow without themselves being arched thereby. The bar e is perforated and rovided with a thread for receiving a tig teningscrewf, by means of which the two bow-arms may be approached to one another.

Two pins 't and lc, irmly screwed or pressed into the arms c and d, serve for fixing the compass-head jaws g and h, the studs of which pins in the form of construction shown are parade semicircular, but may be of-conical orm. Y

specification of Letters patent. l YApplication mea February 15, 1905. serial No. 245,747.

` Patented neg. 5, 1905.

The bow` is mounted on the -compass-head in such a way that after slackening the screw f the arms c and d spring apart and are pushed ,over the compass-head until the studs or pins i 7c snap into the corresponding recesses of the head-jaws. The necessary surface-pressure Vbetween the studs. and the compasshead is then produced by the set-screwf, and the arms of the-bow are held at a suitable distance apart. i

The present invention has the advantage that no loosening of the compass-head in its bearingsV can Vtake place, as the Xed studs cannot be released by the turning of the headjaws during the use of the compass, so that the distance of the bow-arms apart when once adjusted remains constant. i

1.l A compass having a head having a longitudinal slot therein, bow-arms c, d, connectedto said head on opposite sides of the slot, fixed studs carried by the arms c, d, compasshead jaws pivotallyheld between said arms by the studs and a set-screwflocated above the jaws and controlling the relative position of the arms c, d, substantially as described.'v v p 2. A compass having a head, a bar e connected thereto, said head and bar having slots therein, the slots in the head forming a continuation of the slot in the bar, arms c, d, attached to the bar e on opposite sides of the slot therein, compass head jaws pivotally held between lthe arms and a screw f for controlling the relative position of the arms.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORG soHoENNER. i 

